The most current Android operating systems are Android 4.4 KitKat and Android 4.3 Jelly Bean. While Android 4.4 is now beginning to make its rounds on devices connected with Google, many other devices are still catching up on the updates to Android 4.3.

Android 4.4 KitKat has begun to roll out on a number of devices -- namely under the Nexus brand -- but several Google Play-branded devices have also begun to received Android 4.4, as well as the Moto X, which is made by Google-owned Motorola.

Meanwhile, Samsung is busy catching its Galaxy devices up to an Android 4.3 update (currently, there's no word on the Korean manufacturer’s plans for Android 4.4). HTC, Motorola, and Sony have all confirmed that a number of their devices will update to Android 4.4. -- some will update to Android 4.4 after first receiving an Android 4.3 update.

Here's a rundown of the update statuses for several popular mobile devices, according to carrier and manufacturer.